Check Gauges light on 2001 Chevrolet Blazer

The temperature gauge rises and falls while the truck takes awhile to blow warm air from the heater and when it does their is a smell of antifreeze.

Asked by for the 2001 Chevrolet Blazer
sounds like the coolant is low causing the temp to vary. have it checked for leaks and get a bid. from your description, it sounds like the heater core.